The traffic accident rate and its harm in nighttime is more than those in daytime, one important reason is the shortage of night stoppingsightdistance.
夜间的交通事故率及其危害性都远高于白天，一个重要原因是夜间停车视距不足。
2
When stoppingsightdistance can't meet the specification's needs in passing lane outside the median divider in expressway, some measures are put forward for reference of expressway design.